Berlin, Germany - October 26, 2013: Quit please sign in the Humboldt University Library in Berlin requests for silence.

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Keywords: activity, appeal, background, board, calm, caution, disturb, graphic, hand, image, isolated, label, library, lips, logo, message, mouth, privacy, progress, quiet, quit, respect, sign, silence, silent, soundless, sticker, symbol, talk, warning, white, word, work